python json添加建值和读取键值

以下是Python中添加JSON键值和读取JSON键值的示例代码：

1. 添加JSON键值

import json

# 创建一个空的JSON对象
data = {}

# 添加键值对
data['name'] = 'John'
data['age'] = 30
data['city'] = 'New York'

# 将JSON对象转换为JSON字符串
json_data = json.dumps(data)

# 打印JSON字符串
print(json_data)

输出结果为：

{"name": "John", "age": 30, "city": "New York"}

2. 读取JSON键值

import json

# JSON字符串
json_data = '{"name": "John", "age": 30, "city": "New York"}'

# 将JSON字符串转换为JSON对象
data = json.loads(json_data)

# 读取键值
name = data['name']
age = data['age']
city = data['city']

# 打印键值
print(name)
print(age)
print(city)

输出结果为：

John
30
New York